ASTM A249/A249M A249 800H Introduce
ASTM A249/A249M A249 800H steel is an austenitic stainless steel specifically designed for use in boiler, superheater, and heat exchanger tubes. Its high chromium and nickel content make it highly resistant to corrosion and oxidation, and its high strength-to-weight ratio makes it suitable for a range of applications. Furthermore, the steel offers improved heat resistance and good weldability, making it ideal for operations involving higher temperatures.
Smelting temperature:1139°C - 1443°C
Application:Welded austenitic steel tubes for boilers, superheaters, heat exchangers and condensers
ASTM A249/A249M A249 800H Material Chemical Composition
The chemical composition of the ASTM A249/A249M A249 800H steel are as follows:
| Element | Min | Max |
|---|---|---|
| Carbon (C) | 0.0500 | 0.1000 |
| Manganese (Mn) | - | 1.5000 |
| PhOsphorus (P) | - | 0.0450 |
| Sulfur (S) | - | 0.0150 |
| Silicon (Si) | - | 1.0000 |
| Nickel (Ni) | 30.0000 | 35.0000 |
| Chromium (Cr) | 19.0000 | 23.0000 |
| Copper (Cu) | - | 0.7500 |
| Titanium (Ti) | 0.1500 | 0.6000 |
| Aluminum (Al) | 0.1500 | 0.6000 |
| Iron (Fe) | 39.5000 | - |
ASTM A249/A249M A249 800H Material Mechanical Properties
Mechanical properties include requirements for tensile strength, yield strength, hardness, elongation and fatigue limit. Chemical composition requirements range from simple limits on the levels of carbon, manganese and silicon to more complex limits on the levels of chromium, nickel and molybdenum in the steel.
The mechanical properties of the ASTM A249/A249M A249 800H steel are as follows:
| YieldRp0.2 | ≤ 783 (MPa) |
| TeileRm | ≤ 298 (MPa) |
| ImpactKV/Ku | 11(J) |
| ElongationA | 24% |
| Reduction in cross section on fractureZ | 14% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 211 |
ASTM A249/A249M A249 800H Material Thermal Properties
The thermal performance parameters of the ASTM A249/A249M A249 800H steel are as follows:
| Temperature (°C) | 14 | 685 | 212 |
| Modulus of elasticity (GPa) | - | 148 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 43 |
| Thermal conductivity (W/m·°C) | - | 21.3 | 42.2 |
| Specific thermal capacity (J/kg·°C) | - | 421 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.42 | - | - |
| Deity (kg/dm³) | - | - | 222 |
| Poisson’s coefficient, ν | - | - | 143 |
ASTM A249/A249M A249 800H Material Machining Technology
Machining is an essential process used in the fabrication of ASTM A249/A249M A249 800H steel. With its superior mechanical properties, ASTM A249/A249M A249 800H is one of the leading materials for many industrial and consumer product applications. ASTM A249/A249M A249 800H steel is used in a wide range of industries and has many advantages when it comes to machining due to its toughness, strength, and durability. Understanding the differences between machining ASTM A249/A249M A249 800H steel and machining other materials is key to successful applications.